The internet was designed by the US Department of Defence specifically to be robust to attack. The fundamental design that makes it different from earlier telec

The internet was designed by the US Department of Defence specifically to be robust to attack. The fundamental design that makes it different from earlier telecommunications networks is its use of packet switching over circuit switching. DNS, however, is thoroughly centralised and not part of the internet per se. I'm also not sure how redundant and robust the internet is in practice these days. The web certainly has single points of failure like Cloudflare etc. The GNU Name System is an example of a decentralised name system.